Abstract
In river flow, two coefficients can be used to minimize the error in hydraulic calculations introduced by the use of mean velocity, the energy coefficient (α) and the momentum coefficient (β). Both coefficients vary in a range close to and above one; however, it is usually considered to be constant and equal to unit. In this paper, we estimate the two coefficients in three rivers at Northern Greece based on measurements of the water depth, the wetted area and the velocity flow. These measurements were taken for a period of about 2 years, and the results show that the two coefficients are always above unit and vary in time. Also, the coefficients are affected by the existence of the submerged vegetation and by the existence of subsections. The variation of coefficients could be an important parameter in a river flow simulation where the flow conditions differ from the uniform flow.
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Acknowledgements
The data used in this paper were collected in the framework of the elaboration of the national water resources monitoring network, supervised by the Special Secretariat for Water—Hellenic Ministry for the Environment and Climate Change. This Project is elaborated in the framework of the operational program Environment and Sustainable Development which is co-funded by the National Strategic Reference Framework (NSRF) and the Public Investment Program (PIP).
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Pantelakis, D., Hatzigiannakis, E., Doulgeris, C. et al. Calculation of the energy and the momentum coefficients based on measurements in Greek rivers. Model. Earth Syst. Environ. 6, 1163–1175 (2020). https://doi.org/10.1007/s40808-020-00748-3
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DOI: https://doi.org/10.1007/s40808-020-00748-3